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مقاله
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Abstract
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Title:
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Optical coherence tomography grid decentration after manual overlay adjustment and its effect on on macular thickness measurements
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Author(s):
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Khalil Ghasemi Falavarjani MD, Nasser Karimi MD, Foad Amirkourjani MS
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Presentation Type:
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Oral
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Subject:
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Posterior Segment
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Others:
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Presenting Author:
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Name:
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Khalil Ghasemi Falavarjani
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Affiliation :(optional)
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Eye research center, Rassoul Akram Hospital, IUMS
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E mail:
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drghasemi@yahoo.com
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Phone:
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Mobile:
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09121725850
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Purpose:
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To evaluate the rate of optical coherence tomography (OCT) grid decentration after manual overlay adjustment in a routine practice and its effect on thickness measurements.
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Methods:
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During seven usual working days, spectral domain OCT 3D scans from various macular diseases including age related macular degeneration, diabetic macular edema, macular pucker and central serous chorioretinopathy were studied. In each scan, the macular EDTRS grid was evaluated for decentration. After grid adjustment, the changes in central subfield thickness (CST) measurements were recorded.
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Results:
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Ninety-three 3D scans of 93 eyes were evaluated. Thirty-three scans were unreliable for grid adjustment. In the remaining 60 eyes, grid decentration was found in 32 eyes (53.3%). The mean change in CST after grid adjustment was 22.0±44.9 (0-251) microns. CST changes more than 50 microns were found in 7 eyes (11.6 %). No significant relationship was found between underlying disease and grid decentration (P=0.8).
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Conclusion:
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Abnormal retinal thickness map was found in a significant number of scans despite primary overlay adjustment. Interpretation of retinal thickness maps should be cautiously performed.
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Attachment:
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